All combos are different but i'd say 140 is totally safe. Above that taper down. I've run up to 165-170 deg iat on straight 93 and didnt see an issue but wouldnt recommend that necessarily.

 

I start knocking it back around 130 on pump gas setups personally... Logging knock sensors, I have seen a significant increase in detonation after about 135. This is on an LS3 with procharger. Every combo will be different but I tune a lot of boosted setups and have never had pulling at 130 cause a significant loss of power overall, nor have I hurt anything due to high temps. I usually knock 2 degrees out above 130, then starting pulling it more aggressively past low 140s

Best to gather as much data and read plugs when you can.

 

What compression and heads? How big a cam?

 

Thanks for the suggestions guys.
Compression is 9.3.
AFR 227 heads.
Solid roller 249° @ .050
Based on what you guys are saying. I may start pulling slowly at 135°, then get more aggressive above 145°.

 

I dont how different those chambers are from 195 afr's but in general the afr line up out the box have pretty fast ports and quick burning chambers. My old setup was much more sensitive to timing than my current heads but also different cam so not apples to apples. I think 135 is a good safe start

 

I didn't pull any until 200* non intercooled on 93 pump

 

Too many factors to consider. Just as an example, If you are running MBT timing at 77 degrees F, you should be pulling timing anywhere above that.

Engine temp is also a factor. you would run roughly 2 more degrees timing running a motor, tuned for MBT, by dropping ECT from 200 to 180.

Air temp wise, every 20 degrees is going to allow roughly another 1 to 1.5 degrees timing (or, more boost). But on the hot side of things, if you go from say 140 to 160, you may have to knock it back 4 degrees to prevent knock.